code: def nbytes(streamlines):
      return streamlines._data.nbytes / 1024.0**2
  
imports: from copy import deepcopy
  from warnings import warn
  import types
  from scipy.spatial.distance import cdist
  import numpy
  from nibabel.affines import apply_affine
  from nibabel.streamlines import ArraySequence
  from dipy.tracking.streamlinespeed import length, set_number_of_points
  from dipy.tracking.distances import bundles_distances_mdf
  import dipy.tracking.utils
  from dipy.core.geometry import dist_to_corner
  from dipy.core.interpolation import interpolate_vector_3d, interpolate_scalar_3d
label_desc: Use image node_id 17 for calling a global function with example usage: nbytes(streamlines) and returns: unknown